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Mortgage Servicing - Narrative (Details) (USD $)
In Billions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Transfers and Servicing [Abstract]      
Unpaid principal balance of small balance commercial loans serviced $ 2.4 $ 2.6 $ 1.9
Float balances $ 4.1   $ 7.6